Fix typo - sizeof(struct crtl *) -> sizeof(struct ctrl *).

XXX This still assume that bzero() over a field create null-pointers,
which seems a chancy proposition at best.

sys/i386/isa/labpc.c

@@ -399,7 +399,7 @@ labpcinit(void)
 	labpcs = malloc(NLABPC * sizeof(struct ctlr *), M_DEVBUF, M_NOWAIT);
 	if (labpcs)
 	{
-		bzero(labpcs, NLABPC * sizeof(struct cltr *));
+		bzero(labpcs, NLABPC * sizeof(struct ctlr *));
 		return 1;
 	}
 	return 0;